Hi , Can you please help and provide formulas?

Buff Company expects to meet future sales requirements by maintaining an ending inventory equal to 20% of the next quarter's budgeted sales volume. Use this and the information below to complete the Production Budget. Ending finished goods inventory on December 31, 2016 200 Expected sales volume for quarter 1 of year 2018: 2,500 Buff Company Production Budget For the year ending December 31, 2017 Quarter 2 3 4 Year Expected unit sales Add: Desired ending finished goods units Total required units Less: Beginning finished goods units Required production units 1,500 2,000 l-2000